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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28fd27da0e564b57c82b430e41513d70e1c4ec44e2ab65fc0319e2ad63ce34cb' 
  AND token = 'CcYZuCwqOSKW0ISbYr1fR1VXhT9lzf6YcGFgJ85Lw1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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