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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4e314a09f56f0ed8b4ae09518a5689369e53172091cc398e46faeda70686635' 
  AND token = 'yDgGJjjYtYn1rCkH9ur2zZsnoSzkXYa6vJB9u4+VZ1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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