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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029ddea4f66a1094d5e9461b9d950cb9b1a399b0933162995f1d4979de00088a' 
  AND token = 'ksoecCYLK5HZqNHXyt+ICMcRJ4ceNcKDqUUPzWz4KO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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