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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24281bdbf76649ecc729ec8a370a27a0ba9b52e9018914b4f476141b3345564c' 
  AND token = 'vbb0JtqOEj43PKbudKKFz9ALHw24nhQOnWdA/gWkOt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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