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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cf5f485f5b2e5c11f6439745eebc70e1634f54463543194c6dee817ec14ccc6' 
  AND token = 'grB5B/c+NPq4SvEm32FozQNSW6OlKWOLuB4Iy2Zfe9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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