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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf39ec84beecc40c4fb111d05167563fff146fe62c1a4c9ba076ab931d53f99' 
  AND token = '9Kj0DqcHiYPefU/o1848gwKJC6reX3Wmycrsh6WH4jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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