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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd651dab2cfea52f819adc0d3fa50e20a5343138821505d0f2142d6c645633c2' 
  AND token = '3YF03QXHNThLUQJNUb1ts6709R9D7Q4UT28TKkTcVBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}