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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab8d2b6836a5cb4a54cfe62a36594539d1eb95e9b29dc2b25845b373cb6ff8ff' 
  AND token = 'h3d3rx0U63PBH6JOzJ5RYffJ/nnfq/FrJKJcGNXlIy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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