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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf85ccc0b26734e34368178fb9f52403c9377a1e31ea90c017fbdba9486e0c5f' 
  AND token = 'XYtR5Yk9LrXso7C1nBMZdT4xDGPuXRn5x7P41dpVWNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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