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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57249f9da598a1c4f595e643e78ba1369da5bc66488f38711e4b96835438aea' 
  AND token = 'LPX7dKAYV1OrjmrGbeBxV71ANePXVddXW/af8vahAgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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