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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fb512e1c9c753af4300a0821c4449ba7a32aa744869601b5cfba8f8e9acfe12' 
  AND token = '3uBI8wewIad8IxrckM87QF+xx5IfahRU8hEk3NDM78E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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