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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa6a5dc756314a2fe3182b231643d76415518623d9df1718749c39dbdc75fbef' 
  AND token = 'uhgB8VG3NTqUGqeO1D8N4o9yMhONM7Ctl1LohwH4vFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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