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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfc39ac671fb7e30546bcae2ae24e9daf652b84240a10f78555cba813ba504c1' 
  AND token = 'q491zn41RrKFHZgFdFW2QZYhUrr3uIYKRE70tJOzLVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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