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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78b4cb6d82ed56241b390a370253510bdc6b26285c9f4677a10ca255dc1085d1' 
  AND token = '/VIjhlJHx1vNcImMFvVbRx8/x0q8A7hZvwyhyAbHUww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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