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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c7069c2bdd468f5a21b5f9c0bb94f40bc525377d0e7ec41fb6ecc5e824e3ab' 
  AND token = 'NGytfYESCps6WC/1qc2m+yMOJICicQHj7/4z23w6l9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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