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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7677364fee243f0ff860658545be708b7f9d2688604e82f4d14908b233e5c41c' 
  AND token = 'sIk0KQQPx09AkQ6Fni+2XfI+qYjgvadJ2w7O4Qet9UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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