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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d083525c3c86a97b23198db62ad3bf899a7723e4cddb9ef4c8c4aec685b6b7b' 
  AND token = 'Ui+Fuv4ax6BfAO3ZV8OleUNx0rioYYTi4tniRGjfWPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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