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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '869ae5f11e349690909ab35d35e3ec14972123eb317f10f1a4e3708ad87c4c59' 
  AND token = 'zCNWjH+Ms4jNCAHLY5604/9oo0T90zf8fz9BDH7nd3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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