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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e848cd8b0e66aede995094fa79a8080af302e3dded001bc9319d1c086cfdf214' 
  AND token = '3RaV7yTbeXLwOoCaAl6tsjJ6Q9Sha8DLfghME78jkkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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