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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6818858ba32654e9d3c2bedba4ca8c3ad3d13a320f6b06ca6a84a379a115028' 
  AND token = 'xtWovZaTy/sA2nChKqqVyTkqwjJl4/8CMSXifvzc84s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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