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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '105b7fe99a0e4c5d259f0d6ed8fedd134bfb19aab28e06b230ecd2f8d255786c' 
  AND token = 'lbgILUrOn0PiqdGKBjYB9uKvYNMTIig42rOpYUZ3H9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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