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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ae5c0c310df23c429e926cce01b72009454263f8c3b3b4ca558f2104dba65a1' 
  AND token = '5WoNBj9QzmMqZ/OEDfpuAJxvuORL/USRlnZ/x3YSpco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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