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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3449d1e9a203d5f50aefae329931a34d609ac1d84c743c4dd97d655a4743d2c' 
  AND token = 'CoI0JmM77Q5mXqW949Mf57qREvEG0iNtQ7uCetlDm3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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