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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d0381687749a704b30d73950b82b118d56850db82cc9e583c223fe4642fa9e8' 
  AND token = '7TXsD5AM65FudJnGL53qL0+oe+0GYM7sYwehsYdGcc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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