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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1813fec5f521d87728dcbb78627a0dde3d3b8b6df292a266365179316aa6514' 
  AND token = 'mAhREyr+3/wNIsfFBENKt69SLsXhr6Tbr51M0x5GzZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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