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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5499466752d8fe5a0a5a9c9389c3e74d8f51c9caa9b8e3223aa066fad4d42de' 
  AND token = 'XLpaY+TLZESrOLvhZpeVS/VAKcx07rJpMk725rRlYPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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