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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20bc89d4c60fd731f650feb348048eeaa3754e4bf98e58b49fe31189ad81bb3e' 
  AND token = '1fjfgCkh70ZiQRg5LX5NwzurdQUWDlMKzSJBR2P4Sfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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