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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '337d4ad8808c5fbb6c7996515c9fd65166c1f7fbeb5943c8d00cb8feeba0daa1' 
  AND token = 'N7qO9ewNgP3bW3PY1uqP/phfO/zZy6mwQLPNvA5JOe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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