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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '529ce055c0d23799db7151810cb7f0a4e85441c24cb7f05c33f5b80754c0b48c' 
  AND token = 'dflCkRd8M0iFkrZWBswNs73mvHL1FQDGIo1nlyIog2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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