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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd907a5b499a9fd074b467f3b0ca5a9a4a34817613002d103d3127eaa97733d87' 
  AND token = '9OgnDMh79KnC3Yst93QO+0ZRCeKihXHuNxgWa3UPnCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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