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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2e5df39eb3704db1f668a4b53383b1b35ace2b29698aa40a0d9c7947a800ee0' 
  AND token = 'FcHurUvcdzJhPdAq+zit1/CKpy6n5trQspb696pJfec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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