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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2485ef429ceceec438021da9bf1a016c7749e17e9d847c93ade7ee4a0c2b4ff' 
  AND token = 'NDbWtLMFC8Hf1dA9setR9OnCICGmNmjWIrcQpB629ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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