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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '115df74fe244d895ce9e05dd84a98e8a8efc10641c20c3e09a5d6df659d7142c' 
  AND token = 'kUepM1Zx4blB/nLYs3gZ7F5wdPAl3JTh+dc7nuLoDvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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