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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69de039ec2e70cd8ccfa367715973a4769e41bae91008e8d3c3f76803472903b' 
  AND token = '5uOdjatgb+os5OULIfmZ8pByLSF49YBUYW0Fu0X3csc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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