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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af8c63b13cda2246afc0b22e2971756ae042e1afb3530a3f82ff4588c05a4f12' 
  AND token = 'mLTcm3fqYepxS5kX3OImPgrUzlUIL6H6TfAu0QVdebg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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