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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb8662136726ed8cb076c3b1eacc26c1ed287c178c52f2c995ddefe7519695d' 
  AND token = 'dszOi/ZDIpAe0Wh4HZ9HFJngO5VzQF8pLEMP2KRoSHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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