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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '636f8a7daf466c1d4e49a9b835585f74acaf6ffb8cb0002b4bfb16392788ebed' 
  AND token = 'fanD+qngEdOd9Syl9XPhDxhQRMceSnWrQy0aEwqktE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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