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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ce450b84e584385b7ade5517cdecb8abc478df4365516c7319f1cabeb364ab' 
  AND token = 'aDZkUYx6ny7mGk0ZL7NaEVs2QlOZ9xX8V3UaMPsb+vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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