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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efe01618c4f03180d90c139195d0889bef8a1f42c0893cab1dab2f0bbcdafc96' 
  AND token = '5i42y5IEaP/sdftnIme15nnOKT4gbyK60ho8iSst/s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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