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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ed5b53749b10f8a1ae3898efabc596372317fc6b6156e45774a9a4e3ada9749' 
  AND token = 'HL79FP0aZBuRZoqE00YikS+ky5AQitK/72HGY+I5f2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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