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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '271c1a130eb61e5f4048e75c0ce637ae8fca857d6d785c0731a23aa950c888f8' 
  AND token = 'Z4P3ebTpehEYJY6BCJohRUhCaXp1beYFh+f999/pflM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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