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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f529cfe31277305c6015d81934deb44fbc87e477264978f7823b5f50e02f2a47' 
  AND token = 'lb+4lVcRNfQBuUsgjMyVPJ3itE/u7QTuOAJ0lTabdUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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