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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd28e8d7b23ac02424a95a77a8c6c77e64d0093903e0b5c54e57a3d5b7e413b8a' 
  AND token = 'Y9GvnVgEuBnxFShSf543E4qmP3QHTnGS8cepJ5RnURE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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