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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '010a04d86b382a94d271c98fa2224d34bf51e510bd6a49599afb2f45575926ce' 
  AND token = '41i4k+iBtaowmbHlhTrNf1B2t0/Yww58Fs5MAdbW+oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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