SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71466d910a4fdd7ab43a157b96d58ead91510b807c3e2618c9c3161b444a232' 
  AND token = 'RdAUur+eBNOREmF0FA7Fqnnhp+/2zsf4wwSK3Vv7Bow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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