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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc5fc64a6c2a0b3ae2f92b82e1f4905ccdb1ad3129c2fb99ab9dc30e63c28997' 
  AND token = 'aTcj9TAt0si98NBvogaOG8QbLWjSAujKyb/xWGR/Joc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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